QDateTime replaced by QDate, database contains date in format yyyyMMdd
Unit tests reorganized
Retrieves rewritten for Assets and Portfolio in accordance with #25
Missing exception for definition periods
Removed unnecessary try/catch and qDebug in unit tests
Error corrected: in Portfolio::retrieveValues, the first asset wasn't weighted
Exception thrown in Asset when the definition dates are inverted
Merge conflicts fixed
Functional tests of ImportNewData
Merge pull request #37 from pchaigno/tests_ImportNewData2

Tests unitaires pour ImportNewData
Merge conflicts fixed
Skips the first line when retrieving asset's values as it's a header line
retrieveValues methods use retrieveValuesByDate methods to simplify
Perl script to check indentations in Travis
Simplifications in the code to display the portfolios
New unit test for the retrieve methods on weekends
Merge branch 'master' into retrieves
Indentation corrected
issue fixed : a value is missing
Indentations corrected